National jewelry and jade quality supervision and inspection center. Official website, the General Administration of Quality Supervision, Inspection and Quarantine, shows that the diamond waist code is coded by letters and numbers at the waist edge of the diamond, and the National Jewelry and Jade Quality Supervision and Inspection Center is the authority on the detection of jewelry and jade in China, so the appraisal institution at the beginning of the diamond waist code pvp is the National Jewelry and Jade Quality Supervision and Inspection Center.